A Low-Complexity Soft QAM De-Mapper Based on First-Order Linear Approximation

被引：0
|
作者：
Yao, Yanbin [1 ,2 ,3 ]
Su, Yongtao [1 ,2 ]
Shi, Jinglin [1 ,2 ]
Lin, Jiangnan [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, Inst Comp Technol, Wireless Commun Technol Res Ctr, Beijing, Peoples R China
[2] Beijing Key Lab Mobile Comp & Pervas Device, Beijing, Peoples R China
[3] Univ Chinese Acad Sci, Beijing, Peoples R China
来源：
2015 IEEE 26TH ANNUAL INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR, AND MOBILE RADIO COMMUNICATIONS (PIMRC) | 2015年
关键词：
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
High-order QAM modulation schemes are recommended in various communication systems. However, soft demodulating a high-order QAM constellation is complicated when applying traditional methods. In this paper, a novel de-mapper is proposed based on the fact that the clipped LLR can also offer sufficient soft-information, meanwhile the theoretical LLR curves are approximately linear in this clipped range. Hence a first-order linear function is designed to approximate the theoretical value. Simulation results and complexity analysis demonstrate that the proposed de-mapper outperforms traditional approaches in terms of BER performance, and also keeps low complexity.
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页码：446 / 450
页数：5
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